Gas storage well wellbore defect detection method

A defect detection and gas storage well technology, which is applied in electromagnetic measuring devices, electric/magnetic solid deformation measurement, material magnetic variables, etc., to achieve the effects of good repeatability, improved resolution, and simple detection process

CN104391036AInactive Publication Date: 2015-03-04CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-03-04
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a gas storage well wellbore defect detection method. The method is characterized in that the quality characteristics of gas storage well wellbore are detected and evaluated by utilizing the magnetism of a gas storage well wall and by measuring the intensity and attenuation amount of a magnetic field inside the gas storage well and the variation amount of the wellbore. According to the method, in a natural geomagnetic field environment, a magnetic vector sensor and a vortex displacement sensor are used as measuring devices, and a computer is used as a principal computer to control the data transmission and data processing of a detection system. The method has advantages that the method is a novel technique for quality inspection and evaluation of the gas storage well wellbore, no coupling agent is needed, the artificial magnetization is not needed, the equipment is light in weight, the detection process is simple, the detection flow is controlled by machines, the repeatability is good, and the method does not depend on the technical skill and working altitude of the detection personnel.
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Description

technical field

[0001] The invention relates to the technical field of non-destructive testing, in particular to a method for detecting caliper defects of gas storage wells. Background technique

[0002] Non-destructive testing and evaluation is a method of inspecting and measuring the tissue properties and dimensions of defective specimens without damaging the specimens. Among them, the detection of defects is the most widely used, so it is often called "non-destructive testing". "Does not damage the integrity of the object to be inspected" firstly shows that it does not need to take samples from the object, so it will not destroy the integrity of the object; secondly, it will not bring any physical and chemical changes to the object to be inspected, Therefore, it conducts all rather than sampling inspections on the test pieces, and even performs "on-line inspections" on products in the production process. At present, the common methods of non-destructive testing include ...

Examples

Embodiment Construction

[0021] As the best implementation mode of the present invention, it discloses a gas storage well caliper defect detection method. After being magnetized by the geomagnetic field, the magnetism of the gas storage well wall is the excitation source, and the well wall is the detection object. The magnetic vector sensor and the The eddy current displacement sensor is a measuring device. Put the sensor into the wellbore of the gas storage well, and use the motor to control the lifting of the magnetic vector sensor and the eddy current displacement sensor, so that the motor, the magnetic vector sensor and the computer connected to the eddy current sensor work at the same time. and the drop of the eddy current displacement sensor, the change value of the magnetic field strength in the wellbore and the eddy current signal representing the size of the wellbore are transmitted to the computer through the transmission line. deformation. The detection object is further the diameter of the...